The CAS Registry Mumber 66958-64-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,9,5 and 8 respectively; the second part has 2 digits, 6 and 4 respectively. Calculate Digit Verification of CAS Registry Number 66958-64: (7*6)+(6*6)+(5*9)+(4*5)+(3*8)+(2*6)+(1*4)=183 183 % 10 = 3 So 66958-64-3 is a valid CAS Registry Number.
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